The FSC Standard that certificate holders are certified to and follow, allow FSC claims to be based on either weight or volume. LEED 2012 appears to restrict the calculation to weight only. Why doesn't LEED align with the FSC Standard and allow calculations to be based on either weight or volume? Restricting the calculations to weight only will cause confusion in the documentation of FSC products through the supply chain, as many manufacturers have chosen the volume option in lieu of weight to qualify their claims. Companies that take ownership of the manufactured goods that are certified to the FSC Standard under the Transfer System are required by FSC to "transfer" the exact same claim from their vendor’s invoice to their invoice and shipping papers. Manufacturers and distributors of certified goods must be consistent in their claims and cannot base a given FSC claim on both weight and volume. I can only guess that the documentation of the certified wood content will not be accurate if LEED needs does not align with the FSC Standard and allow calculations to be based on weight or volume.